Process for producing carbon disulphide



Patented Mar. 3, 1931 UNITED STATES PATENT OFFICE I EBERHARD LEGELER AND rmonn FISCHER, or ranmnirz, GERMANY, AssroNoRs TO I. G. FARBENINDUSTRIE AKTIENGESELLSCHAFT, OF

GERMANY, A CORPORATION OF GERMANY rRANxmRr-oN-rHE-MAIN,

PROCESS FOR PRODUCING CARBON.DISULJ :H IDE This invention relates to a'process for the fects, insofar as the retorts do not permit the process to be carried on in a continuous manner for any length of time, but have to be closed down and completely emptied at intervals, for the purpose of removing the slag-like residues (i. e. the ash, which has partially been transformed into sulphur compounds) of the consumed charcoal. The residues-partially in the condition of sticky or viscous lumps-adhering to the walls and bottom of the retort have then to be removed through the manholes. Quite apart from the loss of production of carbon disulphide, this stoppage of work entails loss of heat and raw materials; and moreover, the operation of detaching the residues from the walls of the retorts is one of the most disagreeable tasks connected with the production of carbon disulphide, and easily entails damage to V the retort linings.

Another great drawback is the unfavorable reaction of the alternate heating and cooling on the working life of the expensive retorts. Despite this manifest defect, however, no one has hitherto succeeded in devising a working process in which these defects are obviated by enabling the residues to be completely removed in a reliable manner by mechanical means at any convenient time during the process.

Our present invention comprises providing a method of operation which solves this problem. This method consists substantially in transforming the residues into such a modified condition that they can be easily removed from the retorts by mechanical means of known design.

According to our invention, this is accomplished by admixing to the wood charcoal employed for charging the retorts other materials in the form of coarse or fine pieces, which are infusible under the working conditions prevailing in the retorts, and which, owing to their inert chemical attitude tothe passage retort.

No Drawing. Application filed November 6, 1929, Serial No. 405,275, and in Germany November 17,

wards sulphur, entail practically no loss of this substance and which additions take up the charcoal residues formed and combine therewith so that there remains, onthe bottom of the retort, a hard crumbly, granular mass, which by virtue of its being able to roll or run, can be handled by mechanical conveying means In this way, moreover, the incrustation of the retort walls with slag is prevented. a a

Materials suitable for the purpose described are, for example, raw or artificial silica or silicates such as pumice, broken firebrick, refractory slags, and also. sulphide or oxide ores such as pyrites,bauxite or coke. The addition is restricted to the amount considered as certain to produce the desired result, and may vary with the ash content of the wood charcoal, additions equivalent to up to of the amount of charcoal sufficing in any event. y

It is not essential to the attainment of the desired efl'ect, thatrthese additions should be be bound to these limits; in any case, said pieces should not have for effect to obstruct for the sulphur vapors in the After the separation from the residue (for example by screeningbthe additional material can be used overagain, so that additions which involve a slight loss of sulphur when used for the first time can also be employed.

By way of example, the wood charcoal forming the charge can be mixed, prior to its introduction into the charging bunker, with 15% of hard coke in pieces averaging the size of a fist. The pieces of coke covered by and mixed with the residues gradually accumulating on the bottom of the retort are practically free from unconsumed charcoal and are of such a hard and crumbly character that they can easily be discharged, as required, by mechanical appliances of known kind, during the course of the process.

The advantages of the hereindescribed process therefore, are i avoidance of the necessity foristopipingw'ork for the purpose of cleaning out the-retort; and the consequent loss of output; extensive protect'ionof the retorts by, suppressing "considerable fluctuationsof temperature; economy in charcoal 10 and sulphur bylensuring almost complete V utilization of same; economy in heat by the abolition of the heating-up stage; and avoid; ance of incon enience to the Working staff; Q *YVe claim: r 1. In a process for producing carbon disulphide from 'sulphur'and "charcoalby heata ingsarne in retort's'the improvement-which consists inintroducing into the retorts along with the charcoal pieces of a material which 2 isinfusible and chemically inert atthe Working temperature of the retort, and in intermittently withdrawing the residues of the reaction along-with said pieces after consumptionof'th'e charcoal.

: 2. The process for producing carbon disulphide from sulphur and charcoal by heating same in retorts, which comprises introducing intothe 'fretorts in alternating layers charcoal and pieces of a material which is infusible and chemically inert at the working temperature ofthe retort, and intermittently withdrawing the residues of the reaction along with said pieces-after consumption of the charcoal.

'35 3. The process 'for'producing carbon disulphide from sulphur and charcoal by heating same in retorts, Which comprises introducing into the retorts along with the char- 7 coal pieces of coke and" intermittently with- 40 drawing the residues offthe reaction along With said pieces after consumption'of the charcoalp r *4. The'process for producing carbon disulphide from sulphur and charcoal by heat- 4 5 ing same in retorts, "which comprises introducing into the retorts along with the charcoal piecesof coke having about the average size of a fist and intermittently withdrawing the residues of the reaction along with said pieces after consumption of the' charcoal.

, 5. The process for producing carbon di sulphide from;sulphur and charcoal by heat- 7 ,ing same in 'retorts which comprises intro-' ducing into the retorts along With the, charcoal pieces of coke, intermittently withdrawingthe coke after consumption of the charcoal, separating the residue accumulated on said pieces and reintroducing said pieces into "the retort.

He-o Int'estimony whereof, we affix our signatures. 3 I EBERHARD LEGELER.

EUGEN FISCHER. 

